Self-filling reservoir drawing pen



Sept. 23, i930. E. F. WHITE SEL]ld` FILLING RESERVOIR DRAWING PEN FiledMarch 20, 1929 PatentedV Sept. v23, 1.930

UNITED vSTATES ELLIS FOULKES WHITE, OF COLWYN BAY;,ENt'rLAIN'DSELF-FILLING Resum/'0in DRAWING PEN,

Application med March 20,1929, sei-iai No. 348,605, @afmeren BritainAugust 17, 192s.

This invention refers to self-fillingl reservoir drawing or ruling ,pensof the kind havingmeans for varying the thickness of the line to bedrawn, the .invention being primarily intended for use by draftsmen,

tracers, and the like, to save the time and effort now taken by thefrequent re-lling of the ordinary ruling pen.

It is well known that the india ink used by m draftsmen,` etc., veryquickly dries and congeals on the instruments, and it has hitherto beena great drawback in reservoir drawing pens that they do not permit asteady and continuous flow of ink.

The object of the invention is to provide an improved constructionalform of pen of the type referred to, wherein the ink is caused to flowmore readily and continuously from the container or reservoir into thenib, thus overcoming the before mentioned drawback.

v Other advantages will hereinafter appear.

According to the invention, the improved drawing pen comprises a hollowcylindrical body part, a hollow nipple secured to one end of the bodypart and carrying a compressiblc reservoir or container within the bodypart, means to lill and empty the reservoir, a cap i or cover, and anadjustable, interchangeable metal nib secured to the nipple. Said nibhas a hollow parallel-sided shank part with bifurcated end, which end isconical on its exterior and forms what are hereinafter called the legsof the pen. Secured within the hollow shank and extending bothdownwardly between the legs and upwardly into the reservoir is a feedwire, while screwing on to the shank and embracing the legs is a`conical nut, with conical bore, by means of which the legs may becaused to approach fo each other to any desired degreeV within theirnormal limits.

Upon the accompanying drawing Fig. l is an exterior view vof theimproved drawing pen,`the cap being shown in dotted lines in its closedposition.

2 is a sectional elevation of one form of nib, and Figs. 3 and 4 arefurther sectional elevations, on planes at right angles to each other,of a modified form of the nib.

As shown, a is the hollow body of the pen closed at" one end, "andscrewed exteriorly at the other end."l In the open end of the body aissecured a hollow nipple Z) which on its inner endcarries acompressible 4container or reservoir (not shown). c `is a pivotedle-`ver for the filling and emptying of thereserf voir in theknown manner,andd is a cap adapted to screw on to the screwed end of v the body a, orto't theother and tapered end, the parts a., Yc and al in all materialrespects, resembling a `sel`f-illing reservoir writing Fitting into theaxial hole in theY nipple isone ef aseriesA of interchangeable nibs, thenibs 'beingofdifl'erentsizes lto suit the taste of the user,` or thenature of the work Y to bedone.' Each nib A'comprises a hollowparallel-sided shank e, bifurcated at one end u to forni two'legs-f, theends ofwhich are foiz'inedto a'knife edge, and constitute the workingedges of" the` pen. V'l`ilieslia1r1k e is. screwthreaded'` 'on "itsexterior, to* receive the screwedY partofl a conical nut g, 'a `lock-nuth, and to screw into the nipple thelock-nut tbeing screwed against theend of the nipple' to prevent the turning ofthe nib `when i the nut g isturned; The inner faces of the legs f are normally parallel, i, e., whenthe t nut g is removed, but 1.their outerv faces taper towardseach-'other from the shank to their working edges,rso that ongthe nut gbeing" screwed onto proff the shank the legs-may beset atmanyrequireddistance apart and within the limits of their springiness, `and thuslines of differentthicknesses may he drawn. The ,upper end ofthe nut gis flanged',` and kn urled toallow of the adjustments being made by thefinger and thumb of the hand in which the pen is carried.

vTo prevent ink reaching the nut g and then getting on to the backs ofthe legs f, the latter-are made to a width which is less than thesmallest internal diameter of the nut, as clearly seen in Fig. 4. Thenut bears only on the backs of the legs f. Y

The bore of the shank e is made to two diameters, and secured within thelarger bore is a feed wire z', the wire being coiled at 1, and retainedin position by friction. The upper end of the wire extends within thecontainer, and the lower end eXtends to a point between the legs f aboutl from their ends. The lower end of the wire may be free as shownV inFig. 2, but is preferably secured Vto one of the legs as shown in Figs.3 and 4. Further, the wire maybe of wavy form as in Fig. 2 or'mayvbestraight. Tlieprovision of the wire promotes andensuresfa.ready'low'of ink into'the nib of the pen, and being attached to the nib, itremains in position when the nib is removed for cleaning. rori'otherpurposes.

The lock nut 7L may hav'e'aknurled edge I or may be slotted so as tobemanipulated by.

a key, andi will preferablybeof'smaller di# ameter than the vadjustingnut so as not normally toengage tliengers when: .theadjust-4 ing nut' gis beingnmoved.

l.. Ina selfflling reservoir drawinglspen. an adjustable interchangeablemetal vnib. comprising a parallel-sided shank,'screw threaded orthewhole ofvitslength and-.having acentral internal bore, a bifurcatedyextension on oneend o f the shank shaped toform the legs ofthe pen,saidlegs tapering ontheir outer faces from. the shank to their ends, aconical nut with conicalV borejscrewing` on to the shankandembracingithe.legs at its lower endionly, a lock-nuten theshankwand afeed wire securedwithin the bore/.of the shank and extending; upwardlyvinto thereservoir and'downwardlybetween the legsto a point neartheirworking edges, thelegs of thepen being made .to a width .lessthanthesmallest. Y

internal diameter of. theconicalnut, so that the nut bearslonly on theback ofleach leg, and the diameter offthe nut at its` lower' end beingonly slightly. greater than that of the contiguous part ofthe nib, asset forth.

2. In a self-filling reservoir drawingpen according, to`claim:1,.arshank vhaving. a central `internal bore oftwo` diametersv andAa feed wire securedv friction within the .larger boreof'the shank, itsupperendextending into thereservoir, and itslower'end passing throughvthe smaller boreand'being secured tooneof the legs offthepen, assetforth.

In testimony whereof havesigned, my*

name to this specification.

ELLIS 11o "KES WHITE.

